Could I be pregnant??

I had my last depo shot back in October of 2018. I bled from a few days before Thanksgiving until around the second week of December. My boyfriend and I have had unprotected sex the last two weeks of December and first two weeks of January. I didn’t get my following shot in January. My boobs have been hurting for about 3 weeks now and I have been nauseous back and forth for about the same amount of time. Could I be pregnant? I don’t want to test and it’s negative 😔